public void thanhtoanien()
{
try
{
giatien = 0;
Dsmonans mn = new Dsmonans();
int x = int.Parse(txt_idhoadon_hoadon.Text);
List <DataRow> list_ma = mn.tinhtien(x).AsEnumerable().ToList();
foreach (var item in list_ma)
{
giatien = giatien + int.Parse(item[0].ToString());
}
hoadon hd = new hoadon();
List <DataRow> dt = hd.search_khuyenmai(int.Parse(cb_tenkhuyenmai_hoadon.SelectedValue.ToString())).AsEnumerable().ToList();
int discount = 0;
foreach (DataRow item in dt)
{
discount = int.Parse(item[2].ToString());
}
giatien = giatien - giatien * discount / 100;
txt_thanhtien_hoadon.Text = giatien.ToString() + " VNĐ";
}
catch (Exception)
{
}
}
